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並前往https://araisann.github.io/2020/10/13/flutter/TabBar%E9%A1%B5%E7%AD%BE/

TabBar+TabController+TabBarView - null

注意：当TabController重新创建时（比如页签变化了），这时希望 ... TabController( initialIndex: 1, length: typeList.length, vsync: this);

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